Re: Daemonlogger and BPF

[Martin Roesch <roesch () sourcefire com>]

Hi Randy,

Your expression rejects all packets, as Jason said.  I think you want
to use "or" instead of "and" there.

Daemonlogger uses the same BPF file format as all libpcap-derived
programs (tcpdump, snort, etc).  I guess I should mention that in the
docs. :)  If you want to read up on it before I get an update out the
door just 'man tcpdump' and it should all be in there.


Marty


On Mon, Jun 7, 2010 at 12:15 AM, Randal T. RIoux <randy () procyonlabs com> wrote:
> I have a question about the file format for bpf filtering with Daemonlogger.
>
> The syntax isn't described anywhere. However, this is what I know.
>
> "port 80 and port 8080" works fine for the -f command line inclusion.
>
> "port 80 and port 8080 and port 8181" throws this error:
>
>    expression rejects all packets
>
> So, I guess my question really is: what is the proper formatting/syntax
> for BPF usage in Daemonlogger?
>
> Thanks!
> Randy
>
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-- 
Martin Roesch - Founder/CTO, Sourcefire Inc. - +1-410-290-1616
Sourcefire - Security for the Real World - http://www.sourcefire.com
Snort: Open Source IDP - http://www.snort.org

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